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#!/usr/bin/env python3
import re, sys, time
import pacmd, pa
DEFAULT_PRINT = ["properties/media.name"]
config = {
"delay": 0.1, # type: float
"print": [], # type: List[str]
"printall": False, # type: bool
"filter": [], # type: List[Tuple[str, str]]
"filterregex": [], # type: List[Tuple[str, str]]
"do": [], # type: List[Tuple[str, Any]]
}
def usage():
print(\
"""Usage: {argv0} [OPTIONS]
Program for watching and modifying elusive sound events.
By default, this program will regularly poll PulseAudio (using pacmd) for
sink-inputs, and print their details on standard output. You can change the
information printed, filter events, and perform certain actions on matching
events.
Options are as follows:
-config option=value
Configuration options are as follows:
delay: Seconds to sleep between polling for sink-inputs. Default: {config[delay]}
-print key
Prints the given key in the log. If this option is not used at all, by
default the following keys are printed:
{default_print}
The available keys can be scouted by running 'pacmd list-sink-inputs'
while a sound is playing, or by using -printall.
-printall
Print all keys in the log. This is pretty verbose.
-filter key=value
Process only events for which 'key' exists and matches 'value'; if the
key does not exists in an event, it is assumed not to match.
-filter key~=regex
Same as 'filter key=value', except that 'regex' is a Python regex.
-do volume=float
Sets the volume of the event to the given value between 0.0 and 1.0. The
maximum volume is heuristically determined.
-do raw_volume=int
Sets the volume of the event to the given value; this is typically 0 to
65536, but may be different."""
.format(argv0=sys.argv[0], config=config, default_print=DEFAULT_PRINT),
file=sys.stderr)
def parse_args(args):
global config
i = 0
def report_error(fmtstr):
nonlocal i, args
print(fmtstr.format(arg=args[i], prev=args[i-1]), file=sys.stderr)
sys.exit(1)
def next_arg():
nonlocal i, args
if i + 1 < len(args):
i += 1
return args[i]
else:
report_error("Expected argument after '{arg}'")
def parse_kv(arg):
nonlocal i, args
m = re.fullmatch(r"([^=]*)=(.*)", arg)
if m:
return m[1], m[2]
else:
report_error("Expected 'key=value' argument after '{prev}'")
def parse_int(value):
try:
return int(value, 10)
except e:
report_error("Expected integer value in '{arg}'")
def parse_float(value):
try:
return float(value)
except e:
report_error("Expected float value in '{arg}'")
while i < len(args):
if args[i] in ["-h", "--help", "-help"]:
usage()
sys.exit(0)
elif args[i] == "-config":
key, value = parse_kv(next_arg())
if key == "delay":
config["delay"] = parse_float(value)
else:
report_error("Unknown config key in '{arg}'")
elif args[i] == "-print":
config["print"].append(next_arg())
elif args[i] == "-printall":
config["printall"] = True
elif args[i] == "-filter":
key, value = parse_kv(next_arg())
if key[-1] == "~":
config["filterregex"].append((key[:-1], value))
else:
config["filter"].append((key, value))
elif args[i] == "-do":
key, value = parse_kv(next_arg())
if key == "volume":
value = parse_float(value)
if value < 0 or value > 1:
report_error("Volume out of range [0.0, 1.0]: {arg}")
config["do"].append(("volume", parse_float(value)))
elif key == "raw_volume":
config["do"].append(("raw_volume", parse_int(value)))
else:
report_error("Unknown action key in '{arg}'")
else:
report_error("Unrecognised argument '{arg}'")
i += 1
if len(config["print"]) == 0:
config["print"] = DEFAULT_PRINT
def get_key(inp, key):
key = key.split("/")
node = inp.properties()
for item in key:
if item not in node.ch: return None
node = node.ch[item]
return " ".join(node.value) if type(node.value) == list else node.value
def all_keys(inp):
def all_keys_of_node(node, prefix):
res = []
if type(node) == pacmd.Node and node.value is not None:
res.append(prefix[1:])
for k, n in node.ch.items(): res += all_keys_of_node(n, prefix + "/" + k)
return res
return all_keys_of_node(inp.properties(), "")
def filters_allow(inp):
for (key, wanted) in config["filter"]:
value = get_key(inp, key)
if value is None or value != wanted:
return False
for (key, regex) in config["filterregex"]:
value = get_key(inp, key)
if value is None or not re.fullmatch(regex, value):
return False
return True
def format_event(inp):
to_print = config["print"] if not config["printall"] else all_keys(inp)
line = str(inp.index()) + ":"
for key in to_print:
value = get_key(inp, key)
line += " {}={}".format(key, "<none>" if value is None else repr(value))
return line
def perform_event_actions(inp):
for action, arg in config["do"]:
if action == "volume":
assert type(arg) == float and 0 <= arg <= 1
inp.set_volume(arg)
print(" Set volume to {} on {}".format(arg, inp.index()))
elif action == "raw_volume":
assert type(arg) == int
inp.set_raw_volume(arg)
print(" Set raw volume to {} on {}".format(arg, inp.index()))
else:
assert False
class State:
def __init__(self):
self.ongoing = set()
def poll(self):
newev = {inp.index(): inp for inp in pa.list_sink_inputs()}
# Remove events that are not ongoing anymore
self.ongoing &= newev.keys()
# Ignore ongoing events
for k in self.ongoing:
if k in newev:
newev.pop(k)
# New events are now also ongoing
self.ongoing |= newev.keys()
# Ignore any filtered-out events
filtered_out = [index for index, inp in newev.items()
if not filters_allow(inp)]
for k in filtered_out:
newev.pop(k)
for inp in newev.values():
print(format_event(inp))
for inp in newev.values():
perform_event_actions(inp)
def main():
parse_args(sys.argv[1:])
# print(config)
state = State()
try:
while True:
state.poll()
time.sleep(config["delay"])
except KeyboardInterrupt:
sys.exit(0)
if __name__ == "__main__":
main()
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